43121501643 has 32 divisors (see below), whose sum is σ = 63831628800. Its totient is φ = 25673068800.

The previous prime is 43121501629. The next prime is 43121501659. The reversal of 43121501643 is 34610512134.

It is a de Polignac number, because none of the positive numbers 2^k-43121501643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43121501643.

It is not an unprimeable number, because it can be changed into a prime (43121501543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1615278 + ... + 1641756.

It is an arithmetic number, because the mean of its divisors is an integer number (1994738400).

Almost surely, 2^43121501643 is an apocalyptic number.

43121501643 is a deficient number, since it is larger than the sum of its proper divisors (20710127157).

43121501643 is a wasteful number, since it uses less digits than its factorization.

43121501643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27363.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 43121501643 in words is "forty-three billion, one hundred twenty-one million, five hundred one thousand, six hundred forty-three".